STM32 MCUs products

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Resolved! SDMMC does not work after power cycle

Hi,I am using STM32H747. I have successfully write&read micro sd card over SDMMC2 peripheral while debugging. But after debugging, when I power cycle or reset the board, I am not able to use sd card. I see FatFS open file failing. The board is arduin...

serhat1 by Associate
  • 1 replies
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Resolved! SD Write error some time , not stable

Hi ,   I made a STM32F405VGT6 board with SD card interface. The SD code is generated using STM32CUBEMX and FatFs middleware.   The SD file write is not stable, it return error sometimes after calling f_write(). However, if I run the same code in uVis...

MHo.15 by Associate III
  • 5 replies
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Uboot failed when "Saving Environment to MMC..."

Hi,we have an image, install on few SD cards. Most of them boots just fine, but few of them get stuck at  "Saving Environment to MMC...".I tried to reduce the SD clock to 25, 12.5MHz but it doesn't help. Does anyone know where the point to investigat...

Dat Tran by Senior II
  • 0 replies
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eMMC stop and restart

hi all,we have an application that requires powering an eMMC down and then back up while the MCU keeps running. BackgroundWe're successfully using the eMMC connected to the SDMMC1 peripheral running on a 25MHz 8-bit bus, with ClockPowerSave ENABLED. ...

DShar.17 by Associate II
  • 3 replies
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Resolved! STM32H747AI

Hello,I am relatively new here and would like to try to design a STM32H747AI board with LiPo battery power supply for wearable devices with features like OLED microdisplay, WiFi+Bluetooth and GNSS module. Since I would like to run a GUI on it with sm...

FR_NOT_READY with SDIO, microSD 32GB and MCU STM32F407

I was trying to interface a microSD card (32GB) with STM32F407 through SDIO. Tried 1-bit and 4-bit modes. But it always gets me back FR_NOT_READY. and the program always stuck here: FATFS configuration: SDIO configuration: Clock:Where I'm doing any m...

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MKDas by Associate II
  • 0 replies
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STM32F407 SDIO CLK line is running below 400 kHz

Hello,    I have a really strange problem with our STMF407 custom board that connects to a full-size SD Card socket using SDIO.  The MCU uses HSE at 8MHz and SDIO configuration as a 4-bit wide bus and div factor = 0.  All the other values are SDIO de...

PChao.2 by Associate II
  • 2 replies
  • 1 kudos


Hi everyone. I'm trying to build a data logger using a SD Card using SDMMC. I'm using the STM32-H747i DISCO, STM32 Cube IDE and following the example STM32 - Creating a File System on a SD card from STMicroelectronic youtube channel.The program passe...

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JuanBT by Associate II
  • 6 replies
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